1. What is the best way to attach the batteries to the boot: the side strap bracket or that hardware that has to be screwed into the boot? My old M4s with the simple wire clips just don't stay on my boots no matter how I rig them.
2. Do the new E3 batteries last as long as advertised? The website says they're basically equivalent to the old M4.
3. Will my old wall charger for M4s work with E3 and E4 batteries?
4. Has anyone tried those extension cords that snake through your ski pants, allowing you to keep the batteries in pockets? Would be nice to get the weight off your boots but those cords could be pretty annoying snaking up your legs.